Applies To

OS: Windows 10 Mobile

Hardware: Lumia 950

Symptoms

After an update, the phone is rebooting in seemingly inconsistent situations...

Troubleshooting

Following actions were tested:

  1. Shutdown and reboot of the system
  2. Soft reset: 

    See: https://support.microsoft.com/en-us/help/10768/windows-10-mobile-reset-my-phone > Reset an unresponsive phone > Step 1

    "Press and hold the Volume down and Power buttons at the same time until you feel a vibration (about 10 to 15 seconds). "

Suspected Root Cause

After quite some testing and inspecting the battery with battery apps, while measuring the time the phone could run, it looked like the battery charge was not presented correctly.

Solution

The final solution was replacing the battery.

Reference